 It spans the valley of Camlough River.The viaduct consists of 18 arches of 60 ft span, the highest being 126 ft, making Craigmore the tallest viaduct in Ireland.It is around a quarter of a mile long and was constructed from granite stone blocks from the nearby Goraghwood quarry near Goraghwood station, which for many years supplied ballast to the Dublin & Belfast Junction Railway’s lines.